Date: Thu, 17 Jan 2002 09:52:52 +0200 From: "Toomas Aas" <toomas.aas@raad.tartu.ee> To: "Timothy Radigan" <rad2921@cup.edu>, freebsd-questions@freebsd.org Subject: Re: Console Error Messages Message-ID: <200201170753.g0H7rYr19586@lv.raad.tartu.ee> In-Reply-To: <004601c19ecc$095b4d20$9601a8c0@newrevolutions.net>
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Hi Timothy! On 16 Jan 02 at 15:26 you wrote: > dc0: TX underrun -- increasing TX threshold Ethernet cards nowadays send out frames in such a way that they start transmitting before they have received the entire packet from the system. The card knows of a parameter called 'TX threshold', which specifies the number of octets that the card must have at hand to start transmitting the frame. For instance, if TX threshold is 64 octets and a frame of 1500 octets is being sent, the adapter starts transmitting as soon as it has received the first 64 octets and hopes to receive the rest of the data from the upper layers in the stack while transmitting what it already has. If the processing in the upper layers is not as fast as expected, the ethernet controller gets in trouble. It has already sent out a part of the frame but suddenly it notices that the rest of the data is not there! This is the 'TX underrun' error. The dc driver is apparently smart enough to notice such error and dynamically increase the TX threshold value, hoping to avoid such unfortunate events in the future. Thus the 'increasing TX threshold' message. It would be good idea to specify the TX threshold as 1514 octets from the very beginning, to avoid sending garbage (partial frames) to the wire at all. I have no idea if dc driver allows to specify TX threshold value on command line. > Other error messages I get are from named and dhcpd. Sorry, I hope someone else can help you here. My knowledge on named and dhcpd is shallow enough. -- Toomas Aas | toomas.aas@raad.tartu.ee | http://www.raad.tartu.ee/~toomas/ * I`m not as think as you drunk I am... To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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